Screw joint with electromagnetic shielding function

Abstract

The utility model discloses a screw joint with an electromagnetic shielding function, which belongs to the field of screw joints and comprises an inner shielding cylinder, an outer shielding cylinder, two shielding cylinders and a ring reed. Wherein the two shielding cylinders are oppositely arranged, the inner shielding cylinder and the outer shielding cylinder are clamped between the two shielding cylinders, and the inner shielding cylinder, the outer shielding cylinder and the shielding cylinders are communicated with one another and form an inner shielding cavity. According to the spiral joint with the electromagnetic shielding function, in actual assembly and use, signal leakage is effectively isolated by utilizing an internal shielding cavity and an external shielding cavity through two electromagnetic shielding isolation measures; the two groups of shielding cylinders do not affect the shielding performance of an internal shielding cavity even if coaxial errors and relative angle errors occur in actual assembly, and the spiral connector is not only suitable for application occasions of static cavities, but also suitable for working conditions in a vibration environment. And secondary shielding is realized by using a circular ring reed at the end part of the inner shielding cylinder.

Description

Technical Field

[0001] The utility model belongs to the field of spiral joints, and in particular relates to a spiral joint with an electromagnetic shielding function. Background Art

[0002] Electromagnetic shielding is a technical means to reduce or prevent the impact of electromagnetic fields on equipment, lines or systems. It mainly uses specific materials or structures to limit or isolate the propagation of electromagnetic fields, thereby reducing the interference and impact of electromagnetic waves; the main purpose of electromagnetic shielding is to protect equipment or systems from external electromagnetic fields, or to prevent electromagnetic radiation inside the equipment from interfering with the external environment.

[0003] Electromagnetic shielding usually includes material shielding, structural shielding and ground shielding. With the rapid development of modern high-tech and communication technology, higher demands are placed on electromagnetic shielding and electromagnetic compatibility in more and more fields.

[0004] When using traditional electromagnetic shielding means, shielding covers and shielding boxes are mostly used to perform structural electromagnetic shielding between devices. However, when using the above method, since the cables need to pass through the shielding shell to connect to the outside world, during this period, the electromagnetic shielding effect at the contact between the cable and the shielding shell will be reduced due to the opening of the holes in the shielding shell. The traditional solution is to install flange shielding joints at the contact between the cable and the shielding shell for electromagnetic shielding compensation. However, the flange shielding joint is greatly restricted during installation and is affected by axial rotation errors. The overall electromagnetic shielding effect is not good. Therefore, a spiral joint with electromagnetic shielding function is proposed to solve the above problem. Utility Model Content

[0005] In response to one or more of the above defects or improvement needs in the prior art, the utility model provides a spiral joint with electromagnetic shielding function, which has strong electromagnetic shielding efficiency, can perform multi-level electromagnetic shielding, is suitable for application in static cavities, and is also suitable for working conditions under vibration environments.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a spiral joint with electromagnetic shielding function, comprising an inner shielding cylinder, an outer shielding cylinder, two shielding cylinders and a circular spring;

[0007] The two shielding cylinders are arranged opposite to each other and clamp the inner shielding cylinder and the outer shielding cylinder therebetween, and the inner shielding cylinder, the outer shielding cylinder and the shielding cylinder are interconnected to form an internal shielding cavity;

[0008] A shielding pad is also provided between one side of the two shielding cylinders and the adjacent inner shielding cylinder and outer shielding cylinder;

[0009] The outer cylindrical surface of the inner shielding cylinder is welded with spiral fins and evenly distributed holes are opened along the spiral line direction of the spiral fins. The circular spring is wrapped around the spiral fins, and a circular convex ring is arranged on the inner side of the circular spring along the spiral line direction; a welding flange is arranged at one end of the inner shielding cylinder, and the other end is embedded on the outer shielding cylinder using the circular spring;

[0010] A gap formed between the circular spring sheet and the inner shielding tube is filled with a circular elastic shielding strip; a gap formed between the circular spring sheet and the outer shielding tube is filled with an annular absorbing cotton.

[0011] As a further improvement of the utility model, spiral fins are welded on the inner cylindrical surface of the outer shielding tube, and a sealing plate is welded at the root of the spiral fin.

[0012] As a further improvement of the utility model, a spiral spring is arranged in the outer shielding tube, and elastic spiral shielding strips A and elastic spiral shielding strips B are filled between the spiral fins welded to the outer cylindrical surface of the inner shielding tube and the spiral spring, and the elastic spiral shielding strips A and elastic spiral shielding strips B are fitted with the surface of the spiral fins.

[0013] As a further improvement of the utility model, the gap between the spiral fins of the outer shielding tube and the inner shielding tube is filled with spiral absorbing cotton and inner spiral absorbing cotton.

[0014] In general, compared with the prior art, the above technical solutions conceived by the utility model have the following beneficial effects:

[0015] The utility model discloses a spiral joint with electromagnetic shielding function. In actual assembly and use, the spiral joint of the present application utilizes its internal shielding cavity and the outside to effectively isolate signal leakage through two electromagnetic shielding isolation measures. Even if coaxial errors and relative angle errors occur between the two sets of shielding tubes in actual assembly, the shielding performance of the internal shielding cavity is not affected. The utility model is not only suitable for applications in static cavities, but also suitable for working conditions in vibration environments.

[0016] The utility model discloses a spiral joint with electromagnetic shielding function. In actual assembly and use, the spiral joint of the utility model utilizes a spiral spring to divide the spiral space into an inner spiral channel and an outer spiral channel, so that the cross-sectional area of ​​the channel is reduced. In addition, the length of the spiral line is much larger than the axial length of the inner shielding tube and the outer shielding tube, so that the comprehensive shielding efficiency is improved. In addition to utilizing the spiral spring to achieve primary shielding, the spiral joint of the utility model also utilizes the circular ring spring at the end of the inner shielding tube to achieve secondary shielding. The spiral joint of the utility model fills the gap in the domestic market, making the application scenarios of electromagnetic shielding more extensive. At the same time, compared with the traditional flange shielding joint, the utility model is more portable during installation and has a better overall shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall installation structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the inner shielding tube of the utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure between the outer shielding cylinder and the shielding cylinder of the utility model;

[0020] Figure 4 It is a schematic diagram of the overall split installation structure of the utility model.

[0021] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Inner shielding tube; 2. Outer shielding tube; 3. Shielding pad; 4. Shielding tube; 5. Annular elastic shielding strip; 6. Elastic spiral shielding strip A; 7. Elastic spiral shielding strip B; 8. Ring-shaped absorbing cotton; 9. Spiral spring; 10. Annular spring; 11. Spiral absorbing cotton; 12. Inner spiral absorbing cotton. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example

[0024] Depend on Figure 1-4 Provided is a spiral joint with electromagnetic shielding function, comprising an inner shielding cylinder 1, an outer shielding cylinder 2, two shielding cylinders 4 and a circular spring 10;

[0025] The two shielding cylinders 4 are arranged opposite to each other and clamp the inner shielding cylinder 1 and the outer shielding cylinder 2 therebetween. The inner shielding cylinder 1, the outer shielding cylinder 2 and the shielding cylinder 4 are interconnected to form an internal shielding cavity.

[0026] A shielding pad 3 is also provided on one side of the two shielding cylinders 4 and between the adjacent inner shielding cylinder 1 and the outer shielding cylinder 2;

[0027] The outer cylindrical surface of the inner shielding cylinder 1 is welded with spiral fins and evenly distributed holes are opened along the spiral line direction of the spiral fins. The circular spring 10 is arranged along the spiral fins, and a circular convex ring is arranged on the inner side of the circular spring 10 along the spiral line direction; a welding flange is arranged at one end of the inner shielding cylinder 1, and the other end is embedded on the outer shielding cylinder 2 by using the circular spring 10;

[0028] The gap formed between the circular spring piece 10 and the inner shielding tube 1 is filled with a circular elastic shielding strip 5 ; the gap formed between the circular spring piece 10 and the outer shielding tube 2 is filled with an annular absorbing cotton 8 .

[0029] In this embodiment, in summary, the internal shielding cavity formed by the inner shielding cylinder 1, the outer shielding cylinder 2 and the shielding cylinder 4 effectively isolates the signal leakage from the outside through two electromagnetic shielding isolation measures. Even if coaxial errors and relative angle errors occur in the two shielding cylinders 4 during actual assembly, the shielding performance of the internal shielding cavity is not affected. It is not only suitable for application scenarios of static cavities, but also suitable for working conditions under vibration environments.

[0030] It should be noted that in actual use, the annular spring 10 utilizes its own elasticity to be embedded in the evenly distributed holes of the spiral fins. At the same time, a welding flange is arranged at one end of the inner shielding tube 1, and the other end is embedded in the outer shielding tube 2 using the annular spring 10. The boss of the spiral spring 9 is embedded in the hole of the wall of the outer shielding tube 2 to prevent relative rotation and falling off.

[0031] It should be further explained that electromagnetic attenuation is an important indicator for assessing shielding effectiveness. The greater the attenuation of holes and gaps, the better the shielding effectiveness. The attenuation of holes and gaps is inversely proportional to their own cross-sectional area, and is directly proportional to the propagation depth of holes and gaps. The spiral joint of the present application utilizes an annular spring 10 to divide the spiral space into an inner spiral channel and an outer spiral channel, so that the cross-sectional area of ​​the channel is reduced. In addition, the length of the spiral line is much larger than the axial length of the inner shielding tube 1 and the outer shielding tube 2, and the comprehensive shielding effectiveness is improved. At the same time, in addition to utilizing the annular spring 10 to achieve primary electromagnetic shielding, the spiral joint of the present application also utilizes the annular spring 10 at the end of the outer shielding tube 2 to achieve secondary shielding, and the overall shielding effect is better.

[0032] Specifically, refer to Figure 2-4 The inner cylindrical surface of the outer shielding tube 2 is welded with spiral fins, and the root of the spiral fins is welded with a sealing plate.

[0033] In this embodiment, in actual use, the sealing plate arranged on the inner cylindrical surface of the outer shielding tube 2 serves to circumferentially position the inner shielding tube 1, thereby preventing electromagnetic signals from leaking from the ends of the spiral fins, and further improving the electromagnetic shielding effect between the inner shielding tube 1 and the outer shielding tube 2.

[0034] Specifically, refer to Figure 2-4 A spiral spring 9 is arranged inside the outer shielding tube 2, and elastic spiral shielding strips A6 and B7 are filled between the spiral fins welded between the spiral spring 9 and the outer cylindrical surface of the inner shielding tube 1. The elastic spiral shielding strips A6 and B7 are in contact with the surface of the spiral fins.

[0035] In this embodiment, in actual assembly and use, the elastic spiral shielding strip A6, the elastic spiral shielding strip B7, the annular elastic shielding strip 5, the annular absorbing cotton 8, the spiral absorbing cotton 11 and the inner spiral absorbing cotton 12 are all composed of flexible absorbing materials. At the same time, the above-mentioned flexible absorbing materials are installed together with the spiral spring leaf 9 and the annular spring leaf 10 to attenuate electromagnetic waves.

[0036] It should be noted that the annular elastic shielding strip 5 is filled in the gap between the inner annular spring sheet 10 and the inner shielding tube 1, and the annular absorbing cotton 8 is filled in the gap between the inner shielding tube 1 and the annular spring sheet 10. In a preferred embodiment, as shown in the embodiment Figure 2 As shown in the figure, the annular spring sheet 10, the annular elastic shielding strip 5 and the annular absorbing cotton 8 work together to form a first electromagnetic shielding relative to the internal shielding cavity and the outside.

[0037] Specifically, refer to Figure 2-4 The gap between the spiral fins of the outer shielding tube 2 and the inner shielding tube 1 is filled with spiral absorbing cotton 11 and inner spiral absorbing cotton 12.

[0038] In this embodiment, in actual assembly and use, the elastic spiral shielding strip A6 and the elastic spiral shielding strip B7 are jointly filled in the spiral spring 9 and between the spiral fins welded to the outer cylindrical surface of the inner shielding tube 1, and are fitted with the surface of the spiral fins. The spiral absorbing cotton 11 is filled in the gap between the spiral fins of the outer shielding tube 2 and the inner shielding tube 1, and the inner spiral absorbing cotton 12 is filled in the gap between the spiral fins of the inner shielding tube 1 and the outer shielding tube 2. In application, the spiral gap between the inner shielding tube 1 and the outer shielding tube 2 is filled with the elastic spiral shielding strip A6, the elastic spiral shielding strip B7, the spiral spring 9, the spiral absorbing cotton 11 and the inner spiral absorbing cotton 12 to form a second electromagnetic shielding.

[0039] Furthermore, the error compensation principle of the spiral joint of the present application is:

[0040] The spiral spring 9 and the annular spring 10 provided in the present application are filled with annular elastic shielding strips 5, elastic spiral shielding strips A6 and elastic spiral shielding strips B7 when assembled; in a preferred embodiment, the annular elastic shielding strips 5, elastic spiral shielding strips A6 and elastic spiral shielding strips B7 are composed of conductive metal elastic wire mesh, woven into bundles at the same time, and finally filled in the spiral spring 9 to increase the elasticity and shielding effect of the spiral spring 9. When the inner shielding tube 1 and the outer shielding tube 2 cause axial or radial deviation in installation due to coaxiality error, one side of the spiral spring 9 is compressed, and the other side is in a relaxed state at this time. Under the action of the spiral spring 9 itself and the elastic shielding strip, the spiral spring 9 is always pressed on the inner and outer spiral fins formed by the inner shielding tube 1 and the outer shielding tube 2, thereby compensating for the angular error of the inner shielding tube 1 and the outer shielding tube 2 during installation on the premise of always dividing the shielding channel into two inner and outer spiral apertures.

[0041] In summary, in actual assembly and use, the spiral joint of the present application utilizes the spiral spring 9 to divide the spiral space into an inner spiral channel and an outer spiral channel, so that the cross-sectional area of ​​the channel is reduced. In addition, the length of the spiral line is much larger than the axial length of the inner shielding tube 1 and the outer shielding tube 2, so that the comprehensive shielding effectiveness is improved. At the same time, even if coaxial errors and relative angle errors occur between the two shielding tubes 4 in actual assembly, the shielding performance of the internal shielding cavity is not affected. It is not only suitable for applications in static cavities, but also suitable for working conditions under vibration environments.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spiral joint with electromagnetic shielding function, characterized in that; It comprises an inner shielding cylinder (1), an outer shielding cylinder (2), two shielding cylinders (4) and a circular spring sheet (10); The two shielding cylinders (4) are arranged opposite to each other and clamp the inner shielding cylinder (1) and the outer shielding cylinder (2) therebetween; the inner shielding cylinder (1), the outer shielding cylinder (2) and the shielding cylinder (4) are interconnected and form an internal shielding cavity; A shielding pad (3) is also provided between one side of the two shielding cylinders (4) and the adjacent inner shielding cylinder (1) and outer shielding cylinder (2); The outer cylindrical surface of the inner shielding cylinder (1) is welded with spiral fins and has evenly distributed holes along the spiral line direction of the spiral fins; the annular spring (10) is arranged along the spiral fins; the inner side of the annular spring (10) is provided with a circular convex ring along the spiral line direction; one end of the inner shielding cylinder (1) is provided with a welding flange, and the other end is provided on the outer shielding cylinder (2) by means of the annular spring (10); A circular elastic shielding strip (5) is filled in the gap formed between the circular spring sheet (10) and the inner shielding tube (1); and an annular wave-absorbing cotton (8) is filled in the gap formed between the circular spring sheet (10) and the outer shielding tube (2).

2. The spiral joint with electromagnetic shielding function according to claim 1, characterized in that: The inner cylindrical surface of the outer shielding cylinder (2) is welded with spiral fins, and the roots of the spiral fins are welded with sealing plates.

3. The spiral joint with electromagnetic shielding function according to claim 1, characterized in that: A spiral spring (9) is arranged inside the outer shielding tube (2), and an elastic spiral shielding strip A (6) and an elastic spiral shielding strip B (7) are filled between the spiral spring (9) and the spiral fins welded to the outer cylindrical surface of the inner shielding tube (1), and the elastic spiral shielding strip A (6) and the elastic spiral shielding strip B (7) are in contact with the surface of the spiral fins.

4. The spiral joint with electromagnetic shielding function according to claim 1, characterized in that: The gap between the spiral fins of the outer shielding tube (2) and the inner shielding tube (1) is filled with spiral absorbing cotton (11) and inner spiral absorbing cotton (12).

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